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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0468b76cc5d0b928baefa8d1f1195e1149823471df2d9b897f8753239351ae5' 
  AND token = 'dSMRL6beGjPPjNa5RVhk6e5Y1Tl9m0/fIW2TjTbtCoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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