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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c84c05e301d307dbf36a95d80dfa693843b1b89f266582e310c86fbcda31bd' 
  AND token = '5AWpQwHjIYNNsY1/yyqcefu1cyUcPuR7F0s6bE2aF/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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