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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb35e5ef3236c7aad60ced727c4917f1af41144e89e954b500b02bedeaac3eb' 
  AND token = '58yCFpkVbeRWg4WTNNLSj5KMS9gmiXt3DHFiCK4qG24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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