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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32be54ba992b2ed4b7dccba2b3473db99f7e34b266fbd922718dd84ac6c9d2ab' 
  AND token = 'QlAh98SbKaWRQ76V5Go23ZN3109KBeCy23WbtEuJBEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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