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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838c12800aa01a98e93930a70ecbe0bf5f30544a6e3c160fce54d8fee92ac8e0' 
  AND token = 'x60k/Dxf3e/7z3OkTjGMVQ31S2xf67WjE28BjlZHBiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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