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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58818dec53e682ae4cd2d364df085e2611d297d604cd56e4446e691df73fc0fe' 
  AND token = '86o6p0kQ4ZHxvD9hUlVrBaNY+BrGYJrSTSPbmgOYg0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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