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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '096ef10f9ec6155b5c2955498479a768ea7f1fb1a122c73435ae9f0980551639' 
  AND token = 'JRUn01pBciOH9EYzkE7brcM6HNnGcyWPZi2hBFQyJHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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