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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b7cab23ea87e9d9e01268e98e9a08965d508cbb89ffade6695758061030221' 
  AND token = 'UmITHTvgFJdqdC5s/0zlVKZ86Nymxb1FBJRudRJbASk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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