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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c14cb7e3c08820521a4b3f3619c4c01ad15f4d7033b59e2a676e9f9c8985d7' 
  AND token = 'DJKZwxPE40S10WGh3bu3CPTomEHLqNhmO7qwPrmBZbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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