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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90652150de5bcdf29ab229183f4a775f338d042cba88893f62646c1a133f5d1d' 
  AND token = '7QVYOEpYm1UpBsR4qSz31HaM0QbEyNstP8l0KV6uHqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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