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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4af55ea1f9abd4ee9725b28fbf155e51cf74ed581308ce5e340c083226b4fdb1' 
  AND token = 'kLnRj1V3bRNmUzVASxFiEei2W7Q/cGiV94JZv/g72Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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