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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80b4bc9bccc7d2dae71408f411a41c107eba944d22fe8be05ec01c1c8e8c186' 
  AND token = 'mBelffb0yu0L40qWFBZuH94oviJaEhSPWPFM1dZ4dFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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