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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29f8a8a8c6c3fc3fa2ec6906c893985915a4cbdad78ea1f61ffc5e25addb0a4' 
  AND token = 'IGN0hV7KvGAG16B3M7OGY4tbVeRJ0VnxjthjlV6bWhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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