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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e7acd94c42abe2bae7651d890f54451fa3dddab451ca1f1ff4345812989458' 
  AND token = 'zGr0xWpK9ysQWbd7o6uPoczYMqWC09UAnQUFxmZ3Dx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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