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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe4a5ed3df82fd8ed51a850067f7d2d8668c6b561a0efbe05d53c778afa918b' 
  AND token = 'l3o6OzlHuHEPsWLM0f3UpctrmX0K6vR+QMaVfkZe9GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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