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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63ffd14dd1b47e49bc2548cae13ba253324120a2c5011a4a6dd2c953ffaa0cc4' 
  AND token = 'KB4JHFGud/oUToF/Tzirp4/Pppyo428HenBnLml1IKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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