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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8481a6e701a92ab29e1ee8ad94f7b2402312a91fffebd40fcd84fec4bb3cbff' 
  AND token = 's/2ecRuYeD7YxtIGt+CYmkbEmSHf4A8E9KqcG/3B/yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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