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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a74998f447ca6e46258c8353b5959edbe25b8093d7c9cc2343b925c0f0f7ccf' 
  AND token = 'uoc8Idu0PG7yE20DiwtjxYvitQa32Vu2tdDMycng1pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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