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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bf25b9be23e6a8e06462ba2604bd6f4e263f42a07f9d88818fcc4663102b98' 
  AND token = 'iDT1Umef/stWEQ0SGH7tVGZ7d12NUGwb84Fv08tOkBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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