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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d0e89886d15a641204bb31fe8fedb3bd18b2b59ba625a7cb942a747d3a7cb4' 
  AND token = 'C9GWlp+XslB5J7UJuEjd/9rZ4ef/aR0Bhz03+SBQzb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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