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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7deada7cfe44cb0ff4229d5bda56e19dd44bc9aac364de6f5f7e3195153a39b9' 
  AND token = 'CwQWA4HdSTwT8aGa9/jtNeXl8QZ0+n73/VZQQzTF55A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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