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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c3c6e5d82104ae7e7c4874328303396ec86294d1dad51df73d2bc32ce494e2' 
  AND token = 'kzEQic2s4+AuxpjkVI9qOq+rQgHUhxWh27QYUbXUELs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}