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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9267604db71ad256a5674ef2705dffda72ea9ad188cb21eca9dfb254c64df2' 
  AND token = 'JlYy1jaMVg3yK9tHmnbV84YYs6R31E6FQZgvyTKjW7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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