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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d5b24d29a95894aee1c6ee95439c9aa90dde882f35511d53ce04d81078da8a' 
  AND token = 'Y827njiidmT8NZ2odlFhe77PvafRu8zMYRBG9i1ObHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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