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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c53ee97d778d4e7bec2c59346c397be440df06197414787c5b35dd5a152926bc' 
  AND token = 'h6BUGwU0cVf/IcSDQ6rif6tRbK59LC0ncWtadlu9icc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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