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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '375a2863d66c028eac09cc0f487c613dfd1631281a88bf12021085f4be8f9073' 
  AND token = '50a9iw1I4BNcx26+6moOiVWGrUhnyDnvenkdU7vrt60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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