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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c3c83f56bc31275e350508970be4a70ee1fd399e92d54bcfc934b09d8ce273' 
  AND token = '7IAUbQ9F4F1/r9oT63ui2FrAt2FrYOYdRwicnPLsJF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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