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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2dc9ed12736b728edfc6493478af98cfaced0b290fe15006c4ecfe73ba4a887' 
  AND token = 'pCt5p6fEYE+J10QvQlH6Yk/27O1Z57tpo8sUh16cjOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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