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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc65b0bbee5be0e36a7b0c833eb0b1c113bc845f644b183b5d0e7697216bac9' 
  AND token = 'bBWiYB+SfZoOwUH9/dagrBpdht3Zu4txVBaaT+AJVvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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