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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494374036bb400f333d1cd2b70899b3feb3e7e355df0c7daca7343b295c88758' 
  AND token = '6V34PUZhFbKkvExlmnuxd5M5B2v1kNeBgYb/395d55M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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