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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3763a8a81fc514bf50a32ab667203de9590f6e5395ab1ab487ee290a139688c3' 
  AND token = 'VMMPCXAXermJ0t7whhp4UVx8Tzr6zepsi6mpW6O9lmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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