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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc2aef06d81eb1becdd512e77816fa7ecb03a7f876350dc3dfda35f6c7765e5' 
  AND token = 'l1J/+dU2Ply0utwumB0lym65gQyyNx1dcWAD3B3zHEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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