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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b4c78a89cba4d6e1bfd1483d54a2e1953c42da9bee9402d87de4bc28abdad1' 
  AND token = 'q7fXrnnsXgMb/bs4QupO9f/eGKzcriaSwoEtAJEcv68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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