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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13a96a0f5a2b5a291fe52cc123822daaf7653343edf1fbcd719e7d8919c32ae' 
  AND token = 'knJQhCdf5pp+WuEE/0JSGz9VvoI01gXG7y/WMJqMvFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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