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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63fc3e04d5329c2a3e06c5dd94ae6adbe4b380d6b5803606a0ba5aeaaf87c32' 
  AND token = '4cE48z8MkJL4t1KkciQd99Fh95YFQvWQk599rLPDZws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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