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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec963aab58be703d2418ca34cfb507d6c3c6a2883e003d0b05de9c7fd89dcef1' 
  AND token = '2V0FufWZCGdoj48vzf1lF3tHPRenUZqq1zlp6mLuKwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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