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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df32e2079eab0ab4f1bada6394f467394462b3d66f12a6792bdd23bc18311b31' 
  AND token = '8Dqsy5yQkBj2CNdURsqF1E9gKzLBgYV7p4EE14njMpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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