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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cabcb0041ce321289f07c0f90d61f1af9a2936c9fcbbd199db0666b2e5c99082' 
  AND token = 'vidZ0dLv9cMAbMCjqVIqCciMMELCbcbyDTbP+hp3APw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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