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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4d5350a41ecb26db587d8a6f4ece2ea85faf15255f7beff84f3fd0998502c8' 
  AND token = 'Hv/380TZJzaPYTfIu8C3UPybqRlfB3FEI2Zww7eT/ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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