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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '972ec0e651f1ba88904c00c044235918c5634524e8736a7c32750638e716547f' 
  AND token = 'CVzoosQXyR8eHvfY6pikvvmwuMDazOG3m3LCLam8Z28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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