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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff074b15fd95134ee09d286959e0854d142e2c325d3fb0ebcf13521c4323c35' 
  AND token = 'LLewcB49qwd3r0XU6hP+hoove0tj0KnvMZzOqAYO75M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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