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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35c87626c0867914a151ab3f7f81f7ddffa0eaf5b9e2f8450cbfec8a3788ffb' 
  AND token = 'pJEIDQV9mH+zdkComHGaw18Y1pG7U4KEYvEUw6+6yrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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