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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a331c05c2ab9a101cd84c4d775bbcf5d8bc63d52e8fc24f80191d67f785ad74' 
  AND token = 'X+VcLkvtQLt52kT/ms0Qdpdpqn0l0nylPZM2tRcmEbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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