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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b5e4f5667566e7c6eca4b7d523296e64b092de3bb030f6c2741510e27e735a' 
  AND token = 'L0i5tVMFXHSUERKiuQ75PF2HfhQ0D5m5EVfgUEF/QGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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