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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da042f752cb39af06466bfbe91656b5ca81faa6135ca44ec51f6e7c643c8435' 
  AND token = 'Fe4S12zMn5Gn4aeQSEE0tpEWIgSwGbQToHb9Llel1KU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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