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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb7da59c2244903d562e84a6199592a636954ec261f98e2d46db86dc05b6044' 
  AND token = 'z13Hjo4zgmDb7cep1OeCSkHVHypFoBdwBeILk5VoQy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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