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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35c7bc90efcbda82da860572a73560d35e28ca59d8341c6829f3ab559196259e' 
  AND token = 'JYDqHNWuX0+sO4T8XOx33eh3T6/RIq2CqCP281uZuCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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