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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79041666bc0550ab4ce26215920700e6347223abde3e130609c1e1f51a8571b0' 
  AND token = '+rwvR66T9j+C2N21t7Nk3Q/YyKjm7ARV7fuRAQt4AZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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