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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e3dd07e09172da70f3ddaae1b355036d44418038c9d36322aa2c482fd808b8' 
  AND token = 'TnyJm/akWudH6Tz2e38JYdpSIoQ/snDt+R5+MM5GcXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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