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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e2bfe04c83747ef9d5d9c034192152e9e8c6aaabfa44cbac003f0a13147a3a' 
  AND token = 'wLKgbUxQ6MNPaUPs1QTSjR0aX9mZ66nx1yjMJFpLZwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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