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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c1359c37be8e31f07daad36fcb671fef8352361b1b7bbc5c9d158ca1dab8810' 
  AND token = 'dw+cQebG4XDebrGLd82k/LPOrX3X8/cu5CFGOFV99uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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