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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8fba5aacfe3829829ecc95f03aa881b5a0af447f91897593ea216ab869826e' 
  AND token = 'c88r8ZpDMTQVttJ1nk8p3tPlZ34vWQL4p8Op/Rt2sWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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