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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2d7e2de562669a24eb1786cec22199d7bee1394567f4e05208cc1bf5817b31' 
  AND token = 'VjdO4c7XXNFV1qPOhuB5oRz7ndMcdH0y725Hc4/8XIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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