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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfed3e06efc1e9b91d6a56e426ae2c6cac60e1e8789ecdc100bbfb75aff0a674' 
  AND token = '5ZLbJ/IQdqaRWUJpp6mEhOuqV6FjNVby7EArm6IZjr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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