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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ae1e46b66358a1bd4fa10d537ce6cd48563995c5588db34e0da2a17b86c4c6' 
  AND token = 'bnOH0WFKutQgW8fFAmM+ybbLH29A9R4C90T/BhRPurs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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