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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69bbb039dae71a3bed9c9ebf9c284457b0fc5ba480d0b1e038434f9dc8fde3c' 
  AND token = 'ijCSQUvsOlt0Lh00STT1TNesjljUqtBU3mzs44FS2Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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