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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c11ce33ce61c10020b3a2e13737b69c5ee633e51b4b95613110592fc9fca8ba' 
  AND token = 'Use0T8gY/EL8zB7oHgsXoXOvQ22TISeC9HgKYtqilsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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