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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b19c6583c8282b00a77b3d5fde87373e77384bfb0cc7ae8ed93c2177331a6f0' 
  AND token = 'XfCon0nn8Daf74IFCCwySRbCZctqAXMVtDFk0U3L+xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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