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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7c87b5c7a52be10564b1e07380f1f71bb7dd7a591a080d254b0c31af3882e6' 
  AND token = 'YGxcpa3DzPTUZZzq9psoTWlLymNPMp5YggZXVNIG3fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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