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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f3a80674763f75e32e88e54007ecb86711385fd6b14b7b6c333df299bda259' 
  AND token = '4OkolAkIkoKn1mNtaAnXxKJM+0dAq+cjPRUmm/FWnWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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