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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb672cfe8f5ce9d62e1a974ebda73be1b8fcb55e666834f170b2deb48590da0' 
  AND token = 'PbFexhlQtxEvnrflEA5vCylw7cai+2nIBzsSVAhCsH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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