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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e12730ff82516196f9ec0f18115a43e0759492b68e65440fae48b7612da113' 
  AND token = 'MuGvqoXn5S8teaOYTl8TMLcInaNY1THbI7MP6sya784=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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