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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5aa3cf33936f6f6a35115cab762c0274833794ed498c0f4ec7f4ed9d57c7e5' 
  AND token = 'X/KLc4t+BCetA7RQXbqYmA4zwPssEo1wD6S9wqxv/nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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