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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd50b3a647a262d347eb93240f567637785b2ae9191ad932fe98d4195b78118dc' 
  AND token = '3ca/lbmDwrgp20wJ0P4Ncp5eeUZW8ozfOCYrWDmmdsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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