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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34b93dc2537faf2571e80db2d6aee3a1f0d01fd1e45d257775b6aa8f6cdd3e0' 
  AND token = 'lmG9pkeNTf39UVgmGJPTJpWte1+pBKo6Jj8zVgbNv08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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