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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5e3d976d44b0c90a99665eb701b3bdb90334a2c630604c1f24e43fe15373f3' 
  AND token = 'A56dF8D2HaaQ+7qcGlpL7ejD8aEwsNEdb8Vjv9avfP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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